tynan



J. E. & W. P. TYNAN.

Car Truck.

Patented July 16. 1867.

J I U HIV A Inventor:

AM. PHOTD-LITHO.C0. NMWSBORNE'S PROCESS.)

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JOSEPH E. TYN AN AND WILLIAM P. TYNAN, OF PATERSON NEW JERSEY. LettersPatent No. 66,914, dated July 16, 1867.

I IMPROVED LOCOMOTIVE'TRUGK.

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TO ALL WHOM I'LMAY CONCERN:

Beit known that we, Josnrn E. Tynan and WILLIAM P. TYNAN, both ofPaterson, in the county of Passaic, and State of New Jersey, haveinvented-a new and useful improvt ment in Trncks for Locomotives andRailroad Cars; and weh'creby declare the following to be a full, clear,and exact description of the same, reference being bad to theiannexeddrawings, making a. part of this specification, and to the figures andletters marked thereon, in which Figure 1 is a, vertical longitudinalsection.-

Figure 2 is a plan or horizontal view.

Figure 3 is a longitudinal section, the same as fig. 1, but showing theseveral parts in adifi'erent position.

Figure 4 is an end elevation.

Like letters refer to like parts in all the figures.

The nature of our invention consists in giving to trucks, orpilot-wheels of locomotives or cars, or other rolling-stock onrailroads, in addition to the usual centre-bolt or pivot-motion, alateral movement through a limited range, so as to accommodate thewheels of trucks to any difi'erence ofcurvature in the rails which mayexist between the wheels of the truck and the drivers in locomotives, orother accompanying wheels.

A is a strong beam or girder, which spans and is carried by the ordinarytruck-framing. This beam-is secured to the truck-frame by ineansof thelugs, seen upon either end in the drawing, and lies thereon athwart thetrack. It thus, together with the usual framework, unites the oppositewheels of the truck. On the upper surface of the beam A rise two strongflanches, which, besides strengthening the beam, serve as guides to thesocketplate B, which is fitted and rests between said flanches. Thepivot-plate C, the lower portion of which is cylindrical and fittinginto the socket-plate B, is free to revolve within the same. D is acentre or bolster-bolt, for the purpose of uniting A, B, and C, and alsofor the purpose of limiting the motion,- by means of the slot, seen inA, figs. 1, 2, and 3, through which the bolt D.passes. E E are twoelliptical rollers, each having two wings or teeth radiating from itsminor axis. These fit into the slots F F F F, and prevent the rollersfrom leaving their proper position when rolled in either directionthrough the limited range allowed .bythe bolt and slot, seen in figs. 1,2, and 3. The socket-plateB is supported by, and to a certain extent(limited by the slot in A and bolt D) rolls upon the elliptical rollersE E. v The pivot-plate supports the forward end of the boiler or thebody of the car, as the case may be, to which it maybe attached by meansof a saddle-piece or other suitable contrivance, as seen in dotted linesin fig. 1. The truck being thus attached, the pivot-plate C is free torotate in the socket-plate B, and that being-controlledby the fianchesof the beam'A, the truck-wheels will accommodate themselves to thevarying curvature of the rails when moving thereon, if not otherwisecontrolled. But the engine being rigid, and influenced by thedriving-wheels, alateral motion of the truck with reference theretobecomes necessary. This we obtain by allowing the truck to move from thecentre of the boileror body of the car, as thc'case may be, in themanner shown as an extreme example in fig. 3, when the plate B will risein some degree upon the major axis of the elliptical rollers E E, asshown, The weight of the locomotive or car resting, by means of theinterposing plates 0 and B, on the elliptical rollers E E, the tendencyof such weight,

being on a rolling incline, is to force back the parts to a centralposition, as seen in fig. 1, when the drivers of the locomotive aresupposed to be running on a perfectly straight track. Otheraccompanyingp'heels so connected are influenced in the same manner. Thepivot, comprising the plates U and B, is free to, travel from righttoleft or left to right upon the main truck-beam A, as the divergencefrom a straight line in' the rails may occur and bedetermined by thedriving-wheels and the boiler, or by other wheels and car.

We claim the elliptical winged rollers E E, the beam A, the socket-plateB, the pivot-plate (hand bolt D,

when combined together as and for the purposes shown and specified.

JOSEPH E. TYNAN, WILLIAM P. TYNAN.

Witnesses LAWRENCE Hows, MAXTON Hours.

